ruby-clutter 3.2.1-5build1 (amd64 binary) in ubuntu bionic

 Clutter is a GObject based library for creating fast, visually rich,
 graphical user interfaces. Clutter works by manipulating a scene-graph of
 2D surfaces, or 'actors', inside a 3D space.
 .
 This package contains libraries for using Clutter with the Ruby language.